Dulmar guud ee leysarka garaaca

dulmar ku saabsanleysarka garaaca

Habka ugu toosan ee wax loo dhaliyoleysarkagaraaca garaaca wadnaha waa in lagu daro modulator dibadda laser joogto ah. Habkani waxa uu soo saari karaa garaaca garaaca wadnaha ee ugu dhaqsaha badan, in kasta oo fudud, laakiin tamarta iftiinka qashinka iyo awoodda ugu sarreysa kama badnaan karto awoodda iftiinka joogtada ah. Sidaa darteed, habka ugu waxtarka badan ee loo dhaliyo garaaca laysarka waa in la beddelo godka laysarka, kaydinta tamarta wakhtiga ka baxsan tareenka garaaca wadnaha oo lagu sii daayo wakhtiga. Afarta farsamo ee caadiga ah ee loo isticmaalo in lagu dhaliyo garaaca wadnaha iyada oo loo marayo habaynta godka laysarka ayaa ah beddelka korodhka, beddelka Q-bedelashada, faaruqinta godka, iyo hab-qufulka.

Dareemida faa'iidada waxay dhalisaa garaacyo gaagaaban iyadoo wax ka beddeleysa awoodda bamka. Tusaale ahaan, lasers-ka faa'iidada semiconductor-ka ah waxay dhalin karaan garaacyo dhowr nanoseconds ilaa boqol picoseconds iyadoo la adeegsanayo qaabaynta hadda. Inkasta oo tamarta garaaca wadnaha ay yar tahay, habkani waa mid aad u dabacsan, sida bixinta soo noqnoqda soo noqnoqda iyo ballaca garaaca wadnaha. Sannadka 2018, cilmi-baarayaasha Jaamacadda Tokyo waxay soo wariyeen leysarka semiconductor-ka ee femto-second-ga ah, taasoo ka dhigan horumar laga gaaray cilad farsamo 40-sano ah.

Nanosecond-ka xooggan ee garaaca wadnaha ayaa guud ahaan soo saara lasers-ka Q, kaas oo lagu sii daayo safarro wareeg ah oo dhowr ah oo ku yaala godka, tamarta garaacuna waxay ku jirtaa inta u dhaxaysa dhowr millijoules ilaa dhowr joules, iyadoo ku xiran xajmiga nidaamka. Tamar dhexdhexaad ah (guud ahaan ka hooseeya 1 μJ) picosecond iyo garaaca labaad ee femtosecond waxaa inta badan soo saara leysarka qaab qufulan. Waxa jira hal ama in ka badan oo garaaca ultrashort ee resonator laser kaas oo si joogto ah u wareegaya. Mid kasta oo ka mid ah garaaca garaaca wadnaha wuxuu gudbiyaa garaaca wadnaha iyada oo loo marayo muraayadda isku xidhka wax soo saarka, soo noqnoqda guud ahaan waa inta u dhaxaysa 10 MHz iyo 100 GHz. Jaantuska hoose wuxuu muujinayaa kala firdhisanaan caadi ah oo dhamaystiran (ANDi) soliton femtosecondqalabka laser fiber, kuwaas oo intooda badan lagu dhisi karo iyada oo la adeegsanayo qaybaha caadiga ah ee Thorlabs (fiber, lens, mount and displacement table).

Farsamada faaruqinta godka ayaa loo isticmaali karaaLaysarka Q-daraysi loo helo garaaca garaaca gaagaaban iyo laysarka qaab-xidhan si loo kordhiyo tamarta garaaca oo leh soo noqnoqoshada hoose.

Waqtiga domain-ka iyo garaaca goobaha inta jeer
Qaabka toosan ee garaaca garaaca waqtigu waa guud ahaan fudud waxaana lagu muujin karaa Gaussian iyo sech². Waqtiga garaaca wadnaha (sidoo kale loo yaqaan ballaca garaaca wadnaha) waxaa inta badan lagu muujiyaa qiimaha dhererka-badhka dhererka (FWHM), taas oo ah, ballaca kaas oo awoodda indhaha ay ugu yaraan kala badh tahay awoodda ugu sarreysa; Laysarka-Q-ku-beddelka ahi waxa uu abuuraa garaacyo gaagaaban oo nanosecond ah
Laysarada qaabka qufulan waxay soo saartaa garaaca garaaca ultra-gaaban (USP) oo isku xiga tobanaan picoseconds ilaa femtose seconds. Qalabka elektiroonigga ah ee xawaarahoodu sarreeyo waxa kaliya oo uu cabbiri karaa tobanaan picoseconds, garaaca garaaca gaagaaban waxa lagu qiyaasi karaa oo keliya tignoolajiyada indhaha sida autocorrelators, FROG iyo SPIDER. Halka nanosecond ama garaacyada dhaadheer aysan si dhib leh u bedelin ballaca garaaca wadnaha marka ay safrayaan, xitaa masaafada dheer, garaacyada ultra-gaaban waxaa saameyn kara arrimo kala duwan:

Kala firdhisanaantu waxay keeni kartaa balaadhinta garaaca wadnaha oo weyn, laakiin waxa lagu celin karaa kala firdhiso ka soo horjeeda. Jaantuska soo socdaa wuxuu muujinayaa sida Thorlabs femtosecond pulse compressor u magdhabo kala firdhinta mikroskoobyada.

Aan toos ahayn guud ahaan si toos ah uma saamayso ballaca garaaca wadnaha, laakiin waxa ay balaadhisaa xadhkaha xadhkaha, taas oo ka dhigaysa garaaca garaaca mid aad ugu nugul kala firdhiso inta lagu jiro faafinta. Nooc kasta oo fiber ah, oo ay ku jiraan warbaahinta kale ee faa'iidada leh ee xaddidan xaddidan, waxay saameyn kartaa qaabka xajmiga xajmiga ama garaaca wadnaha ultra-gaaban, iyo hoos u dhaca xajmiga wuxuu keeni karaa ballaarinta waqtiga; Waxa kale oo jira xaalado marka ballaca garaaca garaaca garaaca garaaca uu noqdo mid gaaban marka spectrum uu noqdo mid cidhiidhi ah.